2020-10 Security Bulletin: Junos OS: SRX and NFX Series: Insufficient Web API private key protection (CVE-2020-1688)

Product Affected:

This issue affects Junos OS 12.3X48, 15.1X49, 16.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2. Affected platforms: NFX Series, SRX Series.

Problem:

On Juniper Networks SRX Series and NFX Series, a local authenticated user with access to the shell may obtain the Web API service private key that is used to provide encrypted communication between the Juniper device and the authenticator services. Exploitation of this vulnerability may allow an attacker to decrypt the communications between the Juniper device and the authenticator service.

This Web API service is used for authentication services such as the Juniper Identity Management Service, used to obtain user identity for Integrated User Firewall feature, or the integrated ClearPass authentication and enforcement feature.

This issue affects Juniper Networks Junos OS on Networks SRX Series and NFX Series:

12.3X48 versions prior to 12.3X48-D105;
15.1X49 versions prior to 15.1X49-D190;
16.1 versions prior to 16.1R7-S8;
17.2 versions prior to 17.2R3-S4;
17.3 versions prior to 17.3R3-S8;
17.4 versions prior to 17.4R2-S11, 17.4R3;
18.1 versions prior to 18.1R3-S7;
18.2 versions prior to 18.2R3;
18.3 versions prior to 18.3R2-S4, 18.3R3;
18.4 versions prior to 18.4R1-S7, 18.4R2;
19.1 versions prior to 19.1R2;
19.2 versions prior to 19.2R1-S4, 19.2R2.

This issue affects SRX Series and NFX Series configured with Web API.

The example of the config stanza affected by this issue:

[system services webapi https]

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2020-1688.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS 12.3X48-D105, 15.1X49-D190, 16.1R7-S8, 17.2R3-S4, 17.3R3-S8, 17.4R2-S11, 17.4R3, 18.1R3-S7, 18.2R3, 18.3R2-S4, 18.3R3, 18.4R1-S7, 18.4R2, 18.4R3, 19.1R2, 19.2R1-S4, 19.2R2, 19.3R1, and all subsequent releases.

This issue is being tracked as 1289649.

Workaround:

Disallow unprivileged authenticated users access to Junos shell.

Limit shell access to only trusted administrators.

Implementation:

Software releases or updates are available for download at https://www.juniper.net/support/downloads/.

Modification History:

2020-10-14: Initial Publication.

CVSS Score:

6.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)

Severity Level:

Medium

Severity Assessment:

Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Knowledge Base